[GHC] #15227: Add PrelRules for par#

[GHC]

#15227: Add PrelRules for par#
-------------------------------------+-------------------------------------
           Reporter:  dfeuer         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  low            |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
           Keywords:  Newcomer       |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Runtime
  Unknown/Multiple                   |  performance bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 `seq#` and `spark#` are elided when their arguments are known to be
 evaluated. `par#`, however, is not. Presumably this leads to sparks being
 created and then immediately going away.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15227>
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